Dolomite CaMg (CO3) 2 has the largest mass fraction of element 1) oxygen 2) carbon 3) magnesium 4) calcium
June 30, 2021 | education
| Let us determine the mass fraction of each element in the following compound: CaMg (CO3) 2.
First, we find the molar mass of the entire compound.
M (CaMg (CO3) 2) = 40 + 24 + (12 + 16 * 3) * 2 = 64 + 60 * 2 = 64 + 120 = 184 g / mol
Let’s determine the mass fraction of calcium.
M (Ca) = 40 g / mol.
W (Ca) = 40/184 * 100% = 21.7%.
Let’s determine the mass fraction of magnesium.
M (Mg) = 24 g / mol
W (Mg) = 24/184 * 100% = 13%.
Let’s determine the mass fraction of carbon.
M (C) = 12 * 2 = 24 g / mol
W (C) = 24/184 * 100% = 13%.
Determine the mass fraction of oxygen.
M (O2) = 3 * 16 * 2 = 96 g / mol
W (O2) = 96/184 * 100% = 52.2%
This means that oxygen has the largest mass fraction.
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